<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="http://www.baidu.com">
    <!--maxlength最大字符长度
        value设置默认值
        readonly只读
    -->
    用户名：<input type="text" name="username" maxlength="5" value="abc" readonly><br>
    密码：<input type="password" name="password"><br>

    <!--value是单选框必须添加的属性 否则提交on-->
    性别：<input type="radio" name="gender" value="m" id="r1">
    <label for = "r1">男</label>

    <!--checked默认选中-->
    <input type="radio" name="gender" value="w" checked id="r2">
    <label for = "r2">女</label><br>
    兴趣爱好:<input type="checkbox" name="hobby" value="cy">抽烟
    <input type="checkbox" name="hobby" value="hj">喝酒
    <input type="checkbox" name="hobby" value="tt">烫头
    生日:<input type="date" name="birthday"><br>

    靓照:<input type="file" name="picture"><br>

    所在地：
    <!--value设置提交的内容  selected默认选中-->
    <select name="city">
        <option value="bj">北京</option>
        <option value="SH">上海</option>
        <option value="gz" selected>广州</option>

    </select><br>

    <input type="submit" value="注册">
</form>

</body>
</html>